In the gravitational theory containing the second-order interaction of gravity with the scalar and electromagnetic fields at most, the black hole entropy obeying the linearized second law of black hole thermodynamics has been obtained. To generally study the linearized second law of black hole thermodynamics, we extend the gravitational theory to include higher-order interactions of gravity with the

We present a new family of exact vacuum solutions to Pfeifer and Wohlfarth’s field equation in Finsler gravity, consisting of Finsler metrics that are Landsbergian but not Berwaldian, also known as unicorns due to their rarity. Interestingly, we find that these solutions have a physically viable light cone structure, even though in some cases the signature is not Lorentzian but positive definite. We

We compute the leading order contribution to radiative losses in the case of spinning binaries with aligned spins due to their spin-orbit interaction. The orbital average along hyperboliclike orbits is taken through an appropriate spin-orbit modification to the quasi-Keplerian parametrization for nonspinning bodies, which maintains the same functional form, but with spin-dependent orbital elements

DOI:https://doi.org/10.1103/PhysRevD.108.060001

DOI:https://doi.org/10.1103/PhysRevD.108.050001